Auto-reply users that subdomain no longer used

I have a subdomain fax.example.com which users have sent emails to for forwarding to a fax server, e.g. 123456@fax.example.com (123456 is a fax number example).

The fax server is now being replaced with a cloud based solution and users will instead send emails to 123456@cloudfaxprovider.com (123456 is a fax number example)..

My question is if there is a way to auto-reply to users' emails at fax.example.com that they should send emails to the new email address 123456@cloudfaxprovider.com (123456 is a fax number example) during the transition period.

EDIT: Clearly my description above including the use of e.g. to provide an example fax-email address has been misinterpreted. There are no accounts under the subdomain fax.example.com. the "123456" in my example is a fax number.

I have a subdomain fax.example.com which users have sent emails to for forwarding to a fax server, e.g. 123456@fax.example.com

Originally Posted by yonatan

I'll repeat my question again there are no accounts under fax.example.com, so there are no Account Preferences for fax.example.com!

So, your suggestion to set an Out-of-Office message how is that possible for a subdomain or even domain without accounts!

Read your original question, you say there's an email address at 123456@fax.example.com - are you now telling me that this isn't on your server? If that's the case you'd be better explaining what your configuration is rather than posting your comments in bold comments as though I don't understand your question.

Read your original question, you say there's an email address at 123456@fax.example.com - are you now telling me that this isn't on your server? If that's the case you'd be better explaining what your configuration is rather than posting your comments in bold comments as though I don't understand your question.

I've never said that there is an email address 123456@fax.example.com! I've said that there is a subdomain fax.example.com and that email to that subdomain is forwarded to a fax server. The address 123456@fax.example.com was provided as an example of such an email address. If that has not been clear then I apologise.

I did however point out in my second post in reply to your out-of-office suggestion that I was referring to a subdomain and not account which I don't see how it can be misinterpreted!